Reset user info on iPad

Hi I inherited an iPad from my mother in law who’s now deceased. When she had it she never completed setting it up but she logged in with an Apple ID and password. I want to sign her out and sign in with my Apple ID. No matter what I try the iPad insists I enter a password I don’t have. I requested a reset link but it is going to a cell phone no longer in service. I got a verification code to her email and entered it but now I’m told it may take days….is there another way to simply restart this like it’s never belonged to anyone?

see screen shots

Thank you IA

[Image Edited by Moderator to Remove Personal Information]